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Discussion

Epoxy injection is used in a retrofit to

  • A.provide confinement to the core of an existing column with widely spaced ties
  • B.reduce the mass of the structure by replacing concrete with a lighter material
  • C.restore the integrity of cracked concrete
  • D.add flexural strength to a member whose reinforcement is inadequate for the demand

Answer: C

Filling and bonding the crack restores the section's continuity and keeps water and air away from the reinforcement. It is a repair rather than a strengthening measure, and it does nothing about a deficiency of steel or confinement.

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